Location: Eastern Maine

Historical/Current Use: Former textile mill and currently an active cranberry and blueberry processing plant

Contaminants of Concern: Chlorinated solvents, freon, and petroleum compounds

Summary of Impact/Sensitive Receptors: No adverse impact to private homeowner wells, potential impacts to the surface water, documented impacts to bedrock aquifer.

Objective
The purpose of the investigation was to evaluate the potential source and extent of chlorinated solvents detected in one of the facility's groundwater process wells.  The Phase II portion of the investigation consisted of a private water supply well survey, geophysical logging and packer testing of a bedrock well, groundwater slug testing, installation of monitoring wells, and soil and groundwater sampling.

Results
The private water supply well survey identified four residences with water supply wells within a 1,500 foot radius of the site.

Groundwater and topographic contour map of the facility

Geophysical logging data generated from the facility well

Geophysical logging of the bedrock well included single point resistance and spontaneous potential and a caliper survey for determining fractures. The data was used to select specific depths for measuring positive and negative groundwater flow using a flow meter.  Four select fracture intervals were isolated using inflatable packers.  Groundwater samples were collected at each interval and analytical and gauging data inside and outside the packers were compared.  Based on the data collected, CEG concluded the highest concentration of chlorinated compounds was detected at the deepest interval where the most significant water bearing fractures existed.  The soil boring samples and groundwater samples from the four overburden monitoring wells had low levels or no detection of chlorinated compounds.